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. 1991 Sep;88(3):798–805. doi: 10.1172/JCI115379

Acidic polyamino acids inhibit human eosinophil granule major basic protein toxicity. Evidence of a functional role for ProMBP.

R L Barker 1, R H Gundel 1, G J Gleich 1, J L Checkel 1, D A Loegering 1, L R Pease 1, K J Hamann 1
PMCID: PMC295464  PMID: 1715886

Abstract

Eosinophil granule major basic protein (MBP), a potent toxin for helminths and mammalian cells in vitro, is a single polypeptide chain rich in arginine. MBP has been localized on damaged helminths and tissues in hypersensitivity diseases including bronchial asthma. The MBP cDNA indicates that MBP is translated as a slightly acidic preproprotein with an acidic propart. To test the hypothesis that the acidic pro-part of proMBP inhibits the toxicity of mature MBP, acidic polyamino acids (aa) were used as antagonists of MBP toxicity to K562 cells and guinea pig tracheal epithelium and used as antagonists of MBP airway hyperresponsiveness in primates. The acidic poly aa inhibited MBP toxicity and MBP airway hyperresposiveness. The acidic poly aa inhibited MBP toxicity in a charge-dependent manner similar to that proposed for proMBP, suggesting that the acidic pro-part of proMBP functions to mask mature MBP toxicity. This inhibition was not limited to MBP, but also applied to polyarginine and eosinophil cationic protein. These acidic poly aa may be useful to inhibit the actions of a number of cationic toxins released by the eosinophil in numerous hypersensitivity diseases.

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